蒸汽在管道内的最大容许流速，按《城市热力网设计规范》（OJJ34-

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问题单项选择题

蒸汽在管道内的最大容许流速，按《城市热力网设计规范》（OJJ34-2002），不得大于相关规定，下列叙述错误的是（）

A.过热蒸汽公称直径DN＞200m时，最大容许流速为80m／s

B.过热蒸汽公称直径DN≤200m时，最大容许流速为35m／s

C.饱和蒸汽公称直径DN＞200m时，最大容许流速为60m／s

D.饱和蒸汽公称直径删≤200m时，最大容许流速为60m／s

答案

参考答案：D

选择题

下列大洲中，不位于北冰洋沿岸的是（　　）

A．北美洲

B．欧洲

C．大洋洲

D．亚洲

补全对话，情景问答

对话填词（每空一词）。

A: Jenny, you look beautiful tonight. The dress 1. so good on you.

B: Thank you. I 2. it with my friends in the mall last weekend. My parents allow me

to choose my own clothes.

A: Lucky you! My sister and I 3. allowed to choose our clothes at our home. Mum

often 4. decisions for us.

B: What a pity! Look at the boy with 5. over there. He looks so cool!

A: I 6. with you. I don't think boys should be allowed to get their ears 7. .

It's not serious 8. . He should stop wearing those silly earrings.